Shuttle for looms



1931- T. 5. WILSON ET AL 1,800,770

SHUTTLE FOR LOOMS Filed Oct. 12 1 Patented Apr. 14, 1931 UNITED STATES PATENT OFFICE THOMAS SMITH WILSON AND WILLIAM GUN LIFFE, F GARSTON, LIVERPOOL, ENGLAND, ASSIGNORS T0 WILSON BROTHERS BOBBIN COMPANY, LIMITED, OF GARSTON,

LIVERPOOL, ENGLAND SHUTTLE FOR LOOMS Application filed October 12, 1926, Serial No. 141,179, and in Great Britain November 20, 1925.

to minimize thread breakages and to avoid weaving defects liable to arise from the use of self-threading devices, and also to mini mize. the cost of production of such devices.

Weft threading devices for shuttles which consist of one piece of sheet metal provided with two entry traps are known, but these are not designed for nor effective in forming guides acting automatically in respect of the weft being unwound from bobbins, whether thesebobbins be wound either in a clockwise or a counter-clockwise direction, but the traps are more in the nature of traps against upward lift so that they are useless for the purposes of the present invention in automatic weft-filling shuttles.

The invention consists in a shuttle selfthreading device of sheet metal formed in one piece (apart from the guide eye) and providing two forwardly directed thread-retaining entry traps, one directed from each side of the threading slot.

Referring to the accompanying drawings:

Figure 1 is an elevation, and

Figure 2 a plan part of a shuttle containing guiding devices according to one form of the present invention.

Figure 3 is a perspective view of the guiding devices looking from the rear of Figure 2, approximately in the direction indicated by the arrow marked III in Figure 2.

Figure 4: is also a detail view of the guiding devices looking in the direction of the arrow marked IV in Figure 2.

Figure 5 is a plan of the guiding devices practically similar to part of Figure 2, except that the guide is removed from the shuttle.

Figure 6 is an end view of the guiding devices looking approximately in the direction shown by the arrow marked V in Figure 2.

In carrying the invention into effect in the form illustrated by way of example, the improved automatic threading shuttle is provided with any usual type of bobbin-holding device (not shown) adapted for automatic replenishment while the other end is formed with an improved type of threading device. This device is adapted to minimize the amount of metal used in this part of the shuttle. The wooden part of the shuttle a is formed with a longitudinal threading slot 6 on its face. One side 0 of this slot is smoothed off and acts as a thread guide. On the other side is mounted a sheet metal guide (Z which has a contoured surface cl. This guide reinforces the wearing side of the slot and forms the usual forward and inward pointing horn 6 leading to a lateral slot 7' passing the thread 9 to the guide eye h. The upper part of the metal horn is bent over and tapers backwardly following the edge of the lateral slot and its forward end projects laterally across the threading slot leaving a small gap only for the thread to pass and enter the lateral slot f leading to the eye. The downwardly directed part of the horn also has contoured edges (Z and 613 following the lateral slot and is adapted to guide the thread into the lateral slot f. The latter part cl of the horn has a suitably placed hole '5 which the thread can enter by a slot. Through the centre of this hole the straight part j of an eye element passes and extends across the main threading slot projecting a into the other side wall thereof in which it is i emelets n (V wqset r a b- E right angles to one another, rcle'arly shownant secured. The eye element which may be convenientlyof wire forming the guide eye has a projection is formed on it. This projection is arranged to follow thecurvature of the eye and is disposed in such a position that should the thread retraverse the lateral slot and pass over the main horn into the thread ing slot it will still beheld and guided by the projection and on the next motion of the shuttle it;; will be automatically threaded again. 7

The metal guide is thus formedof two Figures- 3 and 4, particularly onelwhich may be called the vertical part cl, forms one side of the threading slot and has its eglgze co n-r V toured to follow the lateral slot leading into theaeye tlrreadguide; while .the.other which naybec alled the horizontal part cl, has a contour ofhornshapewhich forms the other edge ofthe same -side -of:the lateral slot leading to the eye. The vertical part av downwardlyextending flap l fo'lded on itself to form asecuring element extending downinto a narrow-slotin the shuttle body.

This is perforated by holes m thrpugh-which 7 pins or the lilre mf' are passed givinga rigid fasten ng.

The vertical part has also an ,extensionn in the form of alplate which projects across th'e -main threadingslot, This plate.- has an orifice O'registering with the thr'eading slot andit has entry passage formedin its npper edge leading ,ther'einto. At both edges of j this entry passage forwardly; di-

' rected ihorns p and p'l'are formedp and" the entry; passage 'itself" is disposed jaiigularly 1 (preferably in bothplanes) across the; main threading slot so that when self threading" has begun; even although the main horn has n ot been reached-by tlie thr ead before reversal Of-fth8 shuttle motion, gnidanceof the threachwill take place over one or other of these horns during the next forward passfof the shuttle The self threading will tliu slop- 'era te safely whateverbethe hand "of winding of; the weftbobbins and strippinggfron the shuttle' equ-ipped with the self-threading 7 device above described will he, found to prea eer ai ad an eee; oi i at h du e cutting away of the shuttle end a, stronger shnttle stru'cti re' is: obtained in the eyent'of i or the thread es caping from theeyelanpl passing back over the main'horrrthe'tliread will not be broken but will runolfuntil the next pass I of "the shuttle rethreadsQit-overthe horn and replaces it-i'n theeye, the hold of "the thread by the threading device not being lost because the eye trap retains the thread and passes it off until thenext throw 'of the shuttle; while the very simple double trap on entrance avoids the possibility of the device losing the hold of the thread in the'event of the thread not passing over the main horn on the first pass or returning therefrom before 7 passing actually into the eye as'itisheldby one or other ofithe entrance;hornswhatever hand) of 'WiIlCl exist-son the bohbimtheshnttle is lightened owing to the small amount of metal h elfr hread ne evisend a hee is lveryfe'asily for'med'hy'si nple presslng and I stamping operations fron a p'lain sheetlmetal blank.

The iguide shown with the depending plate Zhasa right-angled part 9 serving to prevent tilting .ofitheguid-e in the; shuttle, butzin place of this a flat plate only may be used, sothat the upstanding pa-rt -isnotemployed.

The constructionillustrated includes three thread-retaining traps which maybe defined as follows 1 f (a) combination; of twoteeth forming a double'entry trap permitting 'passa-ge of weft between-them,- but formii'ig guides automatically for-the Weft being unw'ound from-bob bins either clockwise or counterclockwise.

Each ofthe'teethis-adapted to act as a threadretainerby reason of ithe concavity behind eachtooth.- 1 a Alj'nose org-uide for transferring lon- V'gitudinal weft; to transverse eye; :the trap beingsubstantially longitudinally below the nose a'nd adapted to act-as; athread retainer, th'e thread pas'sing off at-the concayity 6.

\ (0) A loo'p iii-the transverse eyeftoprevent by a 'transve'rsej shoulder -'or bend' the weft afterit-has-entered-'frompassing bao'k from' the eye to the nose on 'bac kwardniotionof the shuttle, Here the; thread -retainerover which the thread passes" off *is the concavity We claim as newand desire to securebyLetters"P iitent- -is:- p

1: In a' shuttle'in combination; ashuttle self-threading device of sheet metal formed in one piece and providing at its rearend' two similarly; acting forwardly directed -threadretaining entry traps, one-directed from, each side of the threading slotandia delivery eye guiding element formedof wire with a trans- Verse trap in its stem. r y

.2 Akshuttle for looms adapted for automatic replenishing. of filling or weft having in combination --th ree V traps, "namely (a) a combination of twp, teeth forming a double entry trap permitting passage of weft be tween them but forming guides automatically t f i unw n rom b bbin both clockwise and 'counter clockwise Z) a guide or ranste ri 'a n itudinal weft-r transver'se'eye formed with a horn such as,

aving now described our invention what" 6, adapted to act as a thread retainer substantially longitudinally below the nose, and (a) a wire transverse eye having a loop adapted to prevent by a transverse shoulder the weft after it has entered from passing back from the eye to the nose on backward motion of the shuttle.

In testimony whereof they have signed their names to this specification.

THOMAS SMITH WILSON. VILLIAM GUNLIFFE. 

